Photoemission measurements of transition-metal oxides under laser illumination

J. W. Quilty, J. Y. Son, T. Mizokawa, D. Asakura, N. Motoyama, S. Uchida, T. Kimura, Y. Tokura

Research output: Contribution to journalArticle

Abstract

The effects of photoexcitation on Sr14-xCaxCu 24O41 and La2-2xSr1+2xMn 2O7 single crystals were measured via X-ray photoemission spectroscopy. Changes observed in the Sr14-xCaxCu 24O41 Cu 2p core-level line shape indicate that the cleaved surface is surprisingly unstable under vacuum and that changes in the surface stoichiometry are easily obtained with laser ablation. In La 2-2xSr1+2xMn2O7, the O 1s core-level peak binding energy irreversibly increases upon optical excitation. The magnitude of the increase depends on the sample hole doping and is observed to be largest in a x=0.5 sample, where phase competition between electronic ordered states is strongest. It appears that the photoinduced electronic structural change is permanent due to stabilization by strong electron-lattice coupling.

Original languageEnglish
Pages (from-to)909-912
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume144-147
DOIs
Publication statusPublished - 2005 Jun

Keywords

  • LaSrMn O
  • Photoexcitation
  • SrCaCu O
  • X-ray photoemission

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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